Malicious PDF — malware analysis report

Static analysis result for SHA-256 96fbf240a7b726ad…

MALICIOUS

PDF

85.5 KB Created: 2021-10-08 01:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 18a7463d26e122a0c14f704d0fef7522 SHA-1: 135dc49a64e284cf7c0400c4dc2540ee89bc595e SHA-256: 96fbf240a7b726ad8142044d46af517d5ce05f2d696af3f6abe8bdd8cce7385b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains a large number of embedded URLs, many of which point to disposable hosting, suggesting a link farm designed to distribute malicious content or phish for information. The presence of external URIs and the ML classification strongly suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://philabc.ru/uplcv?utm_term=rescue+cats+near+me+for+adoption
    • https://nevjegyzek.eu/uploads/file/pejove.pdf
    • https://bacninhonline.com/webroot/img/files/61167834973.pdf
    • https://samsungklimamodelleri.com/upload/ckfinder/files/paxilujimupeguzup.pdf
    • http://magnumprint.ru/upload/files/xarotavanekip.pdf
    • http://nyett.hk/uploads/news/files/25231871863.pdf
    • http://jshtextile.com/UserFiles/file///60521546964.pdf
    • https://efckrakow.pl/userfiles/file/koxosefobirelodu.pdf
    • https://www.ruchya.com.tw/upload/files/65865762381.pdf
    • https://didacostruzioni.it/userfiles/file/82272813754.pdf
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210928133048.pdf
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/zekiguvok.pdf
    • https://dpengineers.info/admin/userfiles/file/64612143746.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/wonubigatizesag.pdf
    • http://www.uc-kushiro.net/images/library/File/kufosaditifunupe.pdf
    • https://biomedchita.ru/imeg_master/file/34674194665.pdf
    • http://orosweb.hu/userfiles/file/52738925146.pdf
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gipetowomifagetal.pdf
    • https://ateliersmq.com/pevron/www/img/file/53996699929.pdf
    • http://vandientuchinhhang.com/upload/files/demazemazuwewi.pdf
    • http://tatvan.in/userfiles/file/pasoruf.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaf3fd83fa---pivijefivudixumibilizo.pdf
    • https://xn--fct8ml6mwue.tw/uploads/files/lavijavamirekalowefagu.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e9a2f9eaa2---muvedo.pdf
    • https://agri-mal.pl/userfiles/file/25903804878.pdf
    • http://webinaris.training/ckfinder/userfiles/publics/files/kegugifuxeb.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e614.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE614 16792 bytes
font_01_sfnt_off0000fe2b.bin
f6037ab793c8f043000245b8458ae36186afcc6ed36ec5f56f735a2f428a58f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2B 10880 bytes
font_02_sfnt_off00011754.bin
b40937a65e7ab1764bda2b535808b7b44b055237daa5a04ae2b1907ad880b1ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11754 18912 bytes

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